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I followed advice from you guys. I got hold of a AC power supply with voltage selection from 2V to 10V rms, i.e., a transformer. However it didn't work as the transformer is plugged in via mains which means it shares the same earth as the oscilloscope. I realised I needed to plug them in with...
Thanks for the reply. I see what you mean. The two grounds must be separate but since the function generator and oscilloscope are both power from mains which have the same earth, how can one avoid this. If I plug the oscilloscope to a different earth from another room so the two instruments are...
Hi. I have been tormented by a simple full wave bridge rectifier. Simulation shows full wave from 50hz to 100hz, but on breadboard is just a half wave.
Diode used is 1N4148. I attach here a YouTube link if anyone could spare a moment to point me in the right direction...
Hello. I am working on a project to improve wifi strength of an android tv box in a classroom. It comes with a 50 ohm dipole antenna. In the classroom, the router or repeater is situated in the rear of the classroom. I proposed replacing the antenna with a transmission line fed patch antenna...
I am in the process of planning next year's teaching timetable for about 90 teachers. I was wondering if anyone had heard of a mathematical method to solve timetabling problems. I found a published article on using an optimisation algorithm, but it offers very little insight to the mathematical...
Hi, I have not quite fully understood about the harm due to the ionizing affect of alpha particles in medical physics.
Upon preliminary Google search, I found an article briefly summaries the affect as follow:
1. cell dies
2. cell repairs itself
3. the cell mutates incorrectly and can...
Thanks Ratch for clarifying the term "displacement current". I think at this stage I comprehend Akanimo's explanation the most, and the others' perspectives are definitely worth further reading. So many A-level physics textbooks out there and they are all using the same terms. Otherwise, it will...
Have you got an EM solver? Draw a circular with the parameters as shown and see if it resonates at the desired frequency. This will validate the reliability of the formula as well.
Does the text include calculating the position of the input port too?
Have you tried using Boolean operation to subtract from the square with L1 sides? I find CST workspace is quite easy to draft the unit cell and I can export into AutoCAD and duplicate more if I need to.
Thanks for your help. I enjoyed reading the various answers, some suggestions are clearly beyond my level. My misconception is that I did not know about the conservation of charge law. It is not in the A-level text and therefore, I assumed the conservation of energy law. I will need some time to...
Hi. I thought the energy stored calculated in part (a) would be the final energy stored.
However, the textbook's answer indicate part (a) is 11mJ and part (c) final energy stored = 7.6mJ.
Please help! What is my misconception in this case?
Hi. I have a question on Question 3b. My understanding is that the capacitors are in series, but the solution from the textbook seems to indicate a parallel arrangement assumption. See the attached images. I am puzzled!
Help would be appreciated!
Yes, it gives you a rough idea in the shortest space of time. It is certainly correct if only TE waves are going to propagate along the surface. In truth, there is TM waves to consider. So when you come to write a paper, you should explain why you have neglect TM mode.
In addition, I want you...
ebg direct transmission method
Be aware that this paper only focus on the TE waves. This approach has been known and used since 1999 only to quickly estimate where the suppression bandgap is. However, if you are going use the surface as a high-impedance surface, the TM waves bandgap is an...
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